The 3RB1262-0LM01: The main circuit connects via busbar, so it's designed for direct mounting on the contactor or individual mounting on a backplate — not a DIN-rail clip. The auxiliary circuit uses screw terminals for the control wiring. It supports manual, automatic, and remote reset modes, and includes bistable outputs and ground-fault signaling. The control voltage is 220-240 VAC, 50/60 Hz.
If you need a drop-in replacement for an existing panel, you will need to review the current SIRIUS 3RB3 series for a parametric match in the same frame size and current range. The busbar connection pattern and mounting footprint should be verified against the new part before committing the BOM line.
The 200-820 A current range covers large motor loads. The S10/S12 frame size is physically large. The ground-fault signaling output is a useful diagnostic for ungrounded or high-resistance-grounded systems, common in process industries where a first fault is tolerated but must be annunciated. The bistable outputs hold their state on power loss, which is important for safety circuits that need to remember a trip condition even after a control power cycle.